多级列表ExpandableListView
扩展列表能够显示一个指示在每项显示项的当前状态（状态通常是一个扩展的组，组的孩子，或倒塌，最后一个孩子）。使用setchildindicator（drawable）或setgroupindicator（drawable）（或相应的XML属性）来设置这些指标,一个默认的风格多级列表提供指标，将示给意见多级列表。布局android.r.layout.simple_expandable_list_item_1和android.r.layout.simple_expandable_list_item_2（应用simplecursortreeadapter）包含位置信息的首选指标。
效果图：
1 public class MainActivity extends Activity { 2 private ExpandableListView listView; 3 private List<String> group; 4 private List<List<String>> child; 5 private MyAdapter adapter; 6 @Override 7 protected void onCreate(Bundle savedInstanceState) { 8 super.onCreate(savedInstanceState); 9 setContentView(R.layout.activity_main); 10 11 listView = (ExpandableListView) findViewById(R.id.expandableListView); 12 /** 13 * 初始化数据 14 */ 15 initData(); 16 adapter = new MyAdapter(this,group,child); 17 listView.setAdapter(adapter); 18 19 } 20 21 22 23 24 private void initData() { 25 group = new ArrayList<String>(); 26 child = new ArrayList<List<String>>(); 27 addInfo("笑傲江湖",new String[]{"东方不败","风清扬","令狐冲","岳不群"}); 28 addInfo("天龙八部", new String[]{"乔峰","虚竹","段誉"}); 29 addInfo("九阴真经", new String[]{"中神通","东邪","西毒","南帝","北丐"}); 30 } 31 32 /** 33 * 添加数据信息 34 * @param g 35 * @param c 36 */ 37 private void addInfo(String g,String[] c) { 38 group.add(g); 39 List<String> list = new ArrayList<String>(); 40 for (int i = 0; i < c.length; i++) { 41 list.add(c[i]); 42 } 43 child.add(list); 44 } 45 46 }